I've long run out of plastic pots to grow my plants in, so I had to think of something else (I don't want to spend money on things like planters, and also, why should I use plastic?) and thought: newspaper! Cheap (rather... free), easy to get your hands on, easy to work with! It is temporary, yes, but that makes it great for growing the plants until they're big enough to put outside and then, you can put them in the ground with the pot, as it will soon disintegrate and make yummy compost for your little babies :3

They're totally easy to make, you just need a sheet of paper and a round something. Tutorial can be found here